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Yahoo Groups is now including a banner advertisement for Microsoft
products which layers itself over much of the group site pages and
blocks access to parts of the page including the most useful hyperlinks.

In Firefox, even when the ad is not actually visible, it is simply not
possible to use these hyperlinks due to them falling under the layer in
question.

The use of this type of advertisement is a major inconvenience upon the
functionality of Yahoo Groups making their site nearly unusable and is a
stupid idea.